English：

Steel truss girder of suspension bridge is the main component to bear and transfer loads. Due to its characteristics such as high girder height, large length, heavy load, complex joint, large number of rods, high construction accuracy requirements, heavy lifting affected by water level, and many times of high-altitude construction splicing, there are some problems in the lifting process, such as staggered position of rods, poor high-altitude connection force, difficult construction organization, tight construction period, and large safety risks. In view of this, taking the installation of steel girder of a suspension bridge as the engineering background, BIM technology is used to establish a high-precision digital twin three-dimensional model of the suspension bridge, carrying out detailed construction simulation of the lifting process, comparing and analyzing different construction sequences, coordinating the conflicting parts in the lifting process, and developing an efficient and feasible construction plan. The purpose of lifting steel girder without collision, easy operation of connection, improvement of construction efficiency, safety and guarantee of construction period is realized.